SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8792bb012617ca6208e0182ca62e7ad9b5fb5af58f7ea1625a942fdcef3b5eb6' 
  AND token = 'BA6veqDfzB4BcFE+qAxzJYg/18VUK3JEmmeswM1sc08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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