SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a64f2d77bbd5acfd296c382ca496dc2a7f626993403d584d7ec58e9f2bd7a7e' 
  AND token = 'Rn7YqxJHNrYnhAPa1ZNJnp5WiiX8fVdx/sLKxnqwNzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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