TOUCH
Syntax
        TOUCH key [key ...]
- Available since:
 - 3.2.1
 - Time complexity:
 - O(N) where N is the number of keys that will be touched.
 - ACL categories:
 - 
              
                
@keyspace,@read,@fast, 
Alters the last access time of a key(s). A key is ignored if it does not exist.