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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e87f2970e02e13eb26055606e9e42b7ef86d19f38fd376d88c03b07251c850' 
  AND token = 'aTv7ETdJfFjs2FEOXxY2/YkYX7y67MzBzU35CuooecU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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