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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ca1372f76982aa8082426c792474c50a5fc7b1d983fc28dff48a27bc7de9d1' 
  AND token = 'GWpN3mGse1YMqKhKhyc9S/sXAa5oIdM67Gw9QYHzi5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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