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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815d6ec8fc63ab026bdff3c598bc3634a5959ccccd3e829cc467b251249efd2e' 
  AND token = 'i63y6hjVn9UZoiG1fHURBIaBfUpuTl1arlXLBHOXxhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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