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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4723060d30f1bc139aa94ca69778d671b92ab9b0fd3c3320024c106f8e7642' 
  AND token = 'mQOeRk53eEKuwLOnnquM9JjYySmKErZGGM154d2Rk9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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