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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6899fc2a74f2e6a982df5c0436ed9e7a32329582ac6daf573ac4e0bc7c720df4' 
  AND token = 'i60drSwBnosE/OSN4eL198wpaagB9cTFXZo0sbac5qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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