Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2eafd266ea7b8b30ecaf02aa60bc80ed5a769a35b573c17606e0faa92c90cd' 
  AND token = 'dLt+Z/OLyBEQmFLKG7pJ+nia5svwXnLs9YbCYBr8W40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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