SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950b272bac0044ecab9eea9c506654dea2390c1535af0db5c37b3e0b39cf8936' 
  AND token = '2qYHyC5R2yWUHYM8eJUNGBv4a0GLqUPohlcwiYxw4kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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