SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d06bfb0eef15c5dc0eac2010882a9c18a79f89c64a25b319e8273795b82f6cf' 
  AND token = 'sLKBr/rCFgZTcCzPUU7pNH+oYPkRHSd/uGBH8jHJp4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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