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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c0412db1afccf61c74de6a7f75f2544ef2adb41c3718df5e4db4229bba6827' 
  AND token = 'nU+cFJC7xSZDnTzOUTVX6Z0DLVkJp7T+31pM4jCKd4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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