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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe647ad909dec3106e84c050f7f17755f8a49f07337aa0596592312d720a361a' 
  AND token = '1jFqeptIBWFrUhKnG9B9PaAf4QSfTs0wM/ymkzyhcz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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