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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf499e1c000f2c4ff6c20eb617cfe99a168e6517ddcf2ca0f2c6b1c20277f8f5' 
  AND token = '8zI2Di8YlMxP1WIitRWfefmHoYBiqX/Ch4U/RsMOcuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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