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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fffb058e5d7eed2889e31a71f86ab6f46ce6dbe59812cf4500501edc1e6acac' 
  AND token = 't4CERrC6Gh9ch3tNmdEyvlYzQDgZk34RtrXUwR+eINM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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