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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9797650a55468bb67805e11074505dee9335c95eb320f7fb376190724cd5c72a' 
  AND token = 'SazuLNHn42pDhTr4elMB5u6az36tZ78Ntp8mHHI4Lig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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