SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a0345bfa7a6a9c1a36babd22b30d8714ba087db04aec5411506f5d2685bf46' 
  AND token = 'aUI13l1j6LzFneAVeowI0Y1NI/ZE1w6meeByMvMQB/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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