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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6abd20a25ec60f59c92866d6a1cfc089d4047a8a50f75ed5e6dde7397b4b10' 
  AND token = 'esmSkFL3UIoQSjAkqUHY6XnNBFnc330LOy5XBqtNXIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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