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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17836518a3c19cd6ace6fa5f6761608d6d4dcd97e46700be583ec3efb28fdc2e' 
  AND token = 'yQkDZvW7Aj2vQAIU+GBfxGuubxws8RJSEzCsdkVvPCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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