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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b1c89cfeeb04cbaf2cdbb49daf66cbba62a10900a6672b4ef490f6082348579' 
  AND token = 'uws2+yOGUgK6zB2oBhX4QVEOfDMQAuYKRPfSMqZNRRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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