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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f409f9c5934ac14c6fdddae360a85bb9921588628f2743f3c93b78633d4b86b7' 
  AND token = 'nyg2bptiGcEf04K/PPmLNinexJJScGuaQXKmYFdJ0nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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