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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd258b7f34979ef8ef22612c67e564cd8ceba5ba9bad58bd61b5432f1fd573ef7' 
  AND token = 'V9YAYb+yx36yS5oOs3Z3MvOG/RipsCylLCj57/+Ha/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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