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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd47525cca6bd1f2380ab04ef1d23f2e0a3493f2a060b2a3671d45531a884d58e' 
  AND token = '6IcIfyC7X8ddpB4BKJK7/4zyHJHiLJKWXgnPAS0OafA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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