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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4cf5456042bebcd3936b93f3ed5064045a6f540d43ff3e8daeee7cf9d2b9e1' 
  AND token = 'mhDz7bC9eloA4V8Agjwf+0kWZxvdVTbS0a0BkRzweh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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