SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d032983b2c36e7d94b02f8a940676824270aa20fb7f5c86565a47e1ed502df3' 
  AND token = 'rHopUj2xIT4XvxLHIbCfpVFr9/xBmN+zQQmeq7HLhiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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