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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc3335760b65617c17e23e8679605975fa00949cb79f1fd5d3edd90cefb3633' 
  AND token = 'QROLPtnEJsL0VeJh7d01Nk5bRyQhmjxrTqzI4nNpnYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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