SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca1b732387408c2eca6b2bbfc2e5e62f58ad867af1454958e45b376179fa324' 
  AND token = '3mHj/lETndlBP99MeIz2ICp9Y3w8YKG5e5oWjT4pVVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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