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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea926dc52c1b23b8e3c7480988406e272b92b2ceeea18c8e26a8a54879edf00' 
  AND token = 'rAYJYqxUGEkjuj98iS9syxX/lTMOgwsige+XUXXRo3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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