Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d358253ee3c7bb4b7d7acbb8c83ba398cea253490399f18480b2d2b0b50e6f1' 
  AND token = 'cqxmKB3d2wxXJOb9qyb601jbCOllSVFQb8aD4F6jdR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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