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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb7cde55c12d5c74a8dce2bb74a611a65d04d36b60ef19e4132ae437009e114' 
  AND token = 'jFLCh3qKr46KIyW0F3NY3WYj490dJv++f+s1xTq9ADM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}