simplify lastUsage code

[rekby]

I hereby agree to the terms of the CLA available at: https://yandex.ru/legal/cla/?lang=en

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Other information

[github-actions]

summary

Base version: v3.59.1 (master)
Suggested version: v3.59.2

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.88%. Comparing base (895d516) to head (e079f4f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1155      +/-   ##
==========================================
- Coverage   67.90%   67.88%   -0.03%     
==========================================
  Files         298      298              
  Lines       30113    30115       +2     
==========================================
- Hits        20448    20443       -5     
- Misses       8738     8744       +6     
- Partials      927      928       +1     

Flag	Coverage Δ
	52.63% <100.00%> (+0.01%)	⬆️
go-1.21.x	69.57% <100.00%> (+0.06%)	⬆️
go-1.22.x	67.83% <100.00%> (-0.02%)	⬇️
integration	52.63% <100.00%> (+0.01%)	⬆️
macOS	40.25% <24.00%> (+0.01%)	⬆️
ubuntu	40.22% <24.00%> (-0.04%)	⬇️
unit	40.27% <24.00%> (-0.01%)	⬇️
windows	40.21% <24.00%> (-0.06%)	⬇️
ydb-23.3	47.82% <100.00%> (+0.04%)	⬆️
ydb-24.1	52.53% <100.00%> (+0.03%)	⬆️

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[github-actions]

🌋 Here are results of SLO test for Native ydb-go-sdk/v3 over table-service:

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[github-actions]

🌋 Here are results of SLO test for Go SDK database/sql:

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[github-actions]

🌋 Here are results of SLO test for Go SDK gorm:

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[github-actions]

🌋 Here are results of SLO test for Go SDK xorm:

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