SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a52350fe5a988fb747879dfc727842b88a0b49bf55fff16f04846a18962cc1' 
  AND token = 'X5L8VOuSM+MZ9AiqKcvjGwv1IiuiUSstnWNupgq9qwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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