Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6db02471fc1b3233e7cb52b6b0ef3b6372168c700379aeb5aae3f4ab6ccedf' 
  AND token = 'NDS4AKoiucK2zlC5LcQOGgSDgnJ7me0q5qOLieIa1nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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