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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4055509ab64e182e225f629e3b14220657a9d1342cb0bc7c572159c4a90d047c' 
  AND token = 'NNkbJgCtM+aLTEzFgFC43SFB+V0ybzX5L1+Rc+iTE3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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