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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b35140e8343c6e86e595146c39d2f5b5361415e641dc7fe19f44992976717a' 
  AND token = 'B83M/Nrf1PPTWkUWZ8LhYc5+OYw9mzq4aoTdX6vOwfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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