SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ae47fe15829763d9128cfba5478102082bc3d4f3d776a82ab6b9d82f362db6' 
  AND token = 'D+Hve3QNunU9gONC4jIxyXwNmYNzq27fJKU80G0RZfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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