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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6e38e213b6d7820010b9a6f59ba8b02982ad540e41f0c1fc57bdc0ff27ea50' 
  AND token = 'NRVfq8/Q9rv9fXMuryU7Tg7p/PLlvdnXQCwuvf89q/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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