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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ebe2a4cb49fc4b51188ef3c37ab30d0007eac03cfc87fdb6730946f27d4b172' 
  AND token = 'N10YExpFvQKziqGT6cf+hiLmsX2AlpoF5Owygzmde88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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