meta/tikv: optimise txn scan

[jiefenghuang]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 35.05%. Comparing base (b1090f7) to head (d968420).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/meta/tkv_tikv.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5314       +/-   ##
===========================================
+ Coverage   24.52%   35.05%   +10.52%     
===========================================
  Files          25      129      +104     
  Lines       16540    35945    +19405     
===========================================
+ Hits         4057    12601     +8544     
- Misses      11999    22094    +10095     
- Partials      484     1250      +766     

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