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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de30f691405fc88daf27a11581bb45e320016354d37fb3d37dfb5ec496f59719' 
  AND token = 'gQLYaqpn0wlUyuMPa8m1aGKexN4xnqHFaNsk1l/5FD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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