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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84e7de4ae32c0371c5931e0cd3cbfae7c0496f5773d7c216d4c2c8658b21e4c' 
  AND token = 'UfZmL6csy0CtCcIdXr0Xh3FXOoC1zU/MkPaZA7YvVeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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