Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a075fc742020f1f78aac2c7654b01c46c2431fc9a31165267b19e62e483e01c0' 
  AND token = '0SMbk7RgFOqBOiyVnuYb3/dzZW7pymq1z31zmkeBqac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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