Obtains the index of the cache item that corresponds to key and updates
the access time.
If realtime is enabled and key could be found, access_time is expected
to be at least the time value stored in node. If disabled and
access_time is less, the result is the same as if key could not be
found.
Obtains the index of the cache item that corresponds to key and updates the access time. If realtime is enabled and key could be found, access_time is expected to be at least the time value stored in node. If disabled and access_time is less, the result is the same as if key could not be found.