SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fae70b96cf1f992c85811e2ab0afc6c9f2864fb772c8e23b2453c81f7e0334' 
  AND token = 'J7o/zzhNqUeJjwN9awh+ls1dLPeL5cSvocLUGY2Vqs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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