SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c19e64ea2f696f65eea139dda70ec0926551931f3da7ac1382d23923d459b2' 
  AND token = 'cAmVlXFHj7vZgHH0+/GuTa+WPmOQCqvBuhEEwV8OAJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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