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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7841eb59b0ccc6c7515dcfe77112f35ce7017f0a1e5e1db3b86da6ff449237d8' 
  AND token = 'gtWcXHxkk2QjH1p32ceVKM16vFS1XOQatA9lIdXvkck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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