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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd906ae27e1233a4c477b693c107493f9f197c9cffdc5f40f7e85e28a96e181f7' 
  AND token = 'Y8gaCwseKZ6f7ZAwhz1pcVtyu27Lndag2R1tQpgKu3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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