SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bab15e97e83bedf6cc0f332e65f2847c99afd407641feeac575b91e784fb8c' 
  AND token = 'nB5Lzbzg3nMCqyy/w2di9mVn7uJtrD0HyZfA/RZLI+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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