Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ea78b0ea050863b619290e913c854ff83293166c2f38f149b04bdf93ffe840' 
  AND token = '7Buu+DbvHt3s3GCkyoaJUbGBMIufJyIT0qhVn/VJpnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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