Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738383f18d1e9c9579afe21d4ae192afd06bdb455b2a0f513d7a4e8ec023eb87' 
  AND token = 'a7FEtkQTg9kKiLADm+uW6SYt0+QBvgqSZnWzBzNXQW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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