SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64f1f4c59ae8a980277160aa7da29d17a1751bdb70269843654986e6e65741d' 
  AND token = 'GJ/vycJlkQK7+VerDfdpW348RFwKbXRSwX9xvgrIU2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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