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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d46385be14ef29b6c8e553d678fff053d4765e7c7bdec26dbc6bdf0e556c7b6' 
  AND token = '5G/zqKrGLaSOg6QHUZpLNdwczfezCyUj5B6f6YXInT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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