Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8e0f307c53871887b6c19ed831c80c94750b656293e8a0c3d46923f417fb1d9' 
  AND token = '/wgV3+GYiYvsHNvmJFip0SfHPNg8TDyAeWfjp8FPxW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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