Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1e6dfb9143a8ebd56152feaeaa71e8b551edf09e8190863881c024ce13693c' 
  AND token = 'ynsxs422yudqe8Ig9iwJdfu/MA/HKaO9WMq+clXf79A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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