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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6029e1a94934030e06bfe324304baf866b9229b66f2f5619da48652620b3661' 
  AND token = 'usv0iKvrP4eGISz28hFofef2UzT7PEjiPk9WDRVTfVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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