Skip internal keys' lookup in LRU for the DefaultCache. #1900

Job	Run time
PSV.Linux.22.04.gcc9.Cpplint	8m 25s
PSV.Linux.22.04.gcc9.Tests.CodeCov	9m 36s
PSV.Linux.22.04.gcc9.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 27s
PSV.MacOS14.Xcode15	3m 27s
PSV.iOS.MacOS13.Xcode15	9m 32s
PSV.iOS.MacOS13.Xcode14	9m 44s
PSV.Linux.22.04.gcc13.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	6m 49s
PSV.Linux.22.04.gcc11	8m 21s
PSV.Linux.Android.22.04	5m 30s
PSV.MacOS13.Xcode15.x86_64	6m 57s
PSV.Linux.22.04.clang	8m 57s
PSV.Linux.22.04.gcc13	12m 37s
PSV.iOS.MacOS13.Xcode16	6m 23s
PSV.Win.VC2019	9m 45s
PSV.Commit.Checker	7s
PSV.iOS.MacOS14.Xcode15	5m 24s
PSV.MacOS13.Xcode16	3m 52s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 2s
	1h 59m 55s

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