SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c927df195c6046f13d23f03730d1a3fe1addbd82acfbfce2b61c754ea2abccf' 
  AND token = 'VOpbnO6zJIXCFn/PE588M43KgBKjATNFgbwR+88ITZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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