SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c370b2e6389f5a615b10b46460dc137381a1ccf85136376977b51f651b634f46' 
  AND token = 'bzD/7EZ/rzVLunk+7FitlUqH0Yhveba4pFrjH93V5og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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