SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34570f76faa8cddf5d6f204922c76d61c32b26238dcd191bd048ec8c7e5db1fd' 
  AND token = '58Bovw9nyb9YZSvNr3whSAGWOLc1WC1FKduZ9a/YGBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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