SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02330f12db4f7d3786b4233c20673e49d6a8a38a7f8d72c1a2335569f50540aa' 
  AND token = 'ALbYkqAiFq/4dzGvpCnuVagMc/KbXOIWafRZbDR9cLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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