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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfacdf4a4bc36eccb48825ce4ee7c5058395935a15fe2280039c5403b065b720' 
  AND token = 'fynZU20+ndkisw5v2wWMeiIpawQIUENAigM9/ycx+BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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