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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3011d6d71cc95e84e037d11dd099a76d2e51e6a8a0772030c3f320c160a1eee3' 
  AND token = 'Km2RTHX54QT9RRrKHkrXIToguK91p6nvqxxgA8b5PaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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