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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6f30b97084ea3724a94a29fb8a72f753c6f388684f6fabb06b9daf2f5b1424' 
  AND token = 'hEOYiyDx0IzDJtC/smx31+e1Vhma95fEKMZ5GS1DKj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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