SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6a0fe7edb04fb27911504e65f229778817d070de146330e6fa3e74527728d1' 
  AND token = 'pZsb+Wyy7Mp/m8XiHGx84QRdVwKTPH3ZYzSuGlopScg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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