SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55584adaf5e911b9a0d5fa902e9319cc016efa9e4f7b7741761f94f7102cdf3f' 
  AND token = 'RTK38vp195yVSfFNgWYR1Cc7BMIEz+yu9vCd3CDq/RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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