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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b05f7babb4dd13f415fa060dfe25db229f637d4f12ff855a8ce3a0501b8401' 
  AND token = 'NkvGJYyYFM80MmJjVN8RAyhdmLNEXUDcu+3idhJhjwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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