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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a55b98d5285d1999b936abd64e93dbe9a2ccca3ad7a99a08820b9b7b170114e' 
  AND token = '5qPmrYxgex/DWraPmLoBdWk0dD3RTN7+UgDlj8cQQ+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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