SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f049fa355564081adb54e195cac0b4ab4c299066d5af07e69cd7e7bd4b2046' 
  AND token = 'sheUxX+mLATQ/hsjZx6UnGIawHXZCtkNuj7aoMgRVBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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