SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '221007ea2afb0284f7b79dfda634a3bd312576cb5d5998959741efc27f03b3eb' 
  AND token = 'Bg8jaW/LITXEdDXD8uXm0WQx0lZLg7KX7X9ICKZVzZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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