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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf8c9f4661440268e618891037b27eb66ec3ba3c05ce022624148c687af2e37' 
  AND token = 'vHYxunblrcTUZf0UZqJFOxYl75vFnR14mAzjrK6jU18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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