SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf419143cfc40119d2c379dba9b9897365ee828a8e6ad9740310534f9e25e57d' 
  AND token = 'nuj7ZGBGguOR6mSNqYbwqaVqjxc9t6K3bwmL/dRgk94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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