SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183bfcf05d59d032b5eaaf347ec3dab5c741604669262b4b363eb32cbb21b96d' 
  AND token = 'K/gzOMXpDkVtV28wBuumRdWkGFszTuq29x3g9HEpwhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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