Skip internal keys' lookup in LRU for the DefaultCache. #1896

Job	Run time
PSV.Linux.22.04.gcc9.Tests.CodeCov	5m 26s
PSV.Linux.22.04.gcc11	7m 49s
PSV.Linux.22.04.gcc13.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	6m 36s
PSV.iOS.MacOS13.Xcode15	13m 6s
PSV.Linux.Android.22.04	6m 29s
PSV.Linux.22.04.gcc13	15m 21s
PSV.Linux.22.04.gcc9.Cpplint	8m 43s
PSV.Linux.22.04.clang	9m 10s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 9s
PSV.MacOS13.Xcode15.x86_64	6m 33s
PSV.MacOS14.Xcode15	4m 26s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	3m 10s
PSV.iOS.MacOS13.Xcode14	11m 26s
PSV.iOS.MacOS14.Xcode15	5m 28s
PSV.MacOS13.Xcode16	4m 53s
PSV.iOS.MacOS13.Xcode16	5m 12s
PSV.Win.VC2019	9m 38s
PSV.Commit.Checker	7s
	2h 5m 42s

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