SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9714143dd3c0f7e25e51c018d971d36dc87438f72fa218fab9f749ab9f525f88' 
  AND token = 'z6TlNqQsKk3qJu8sWYoYDxcJQKO5SWgFf/vqYpY2Izo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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