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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0fab1da888412f21548fb5852c2a44735f27e0db4090ea8b62a2533791d0ef4' 
  AND token = 'UYtbM8JDQa+XaFVE7uTFt3jjpDI4mvE+c/mrZ/EIB1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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